666436161253 has 2 divisors, whose sum is σ = 666436161254. Its totient is φ = 666436161252.

The previous prime is 666436161247. The next prime is 666436161257. The reversal of 666436161253 is 352161634666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 568903622049 + 97532539204 = 754257^2 + 312302^2 .

It is a cyclic number.

It is not a de Polignac number, because 666436161253 - 2⁵ = 666436161221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666436161197 and 666436161206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666436161257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333218080626 + 333218080627.

It is an arithmetic number, because the mean of its divisors is an integer number (333218080627).

Almost surely, 2^666436161253 is an apocalyptic number.

It is an amenable number.

666436161253 is a deficient number, since it is larger than the sum of its proper divisors (1).

666436161253 is an equidigital number, since it uses as much as digits as its factorization.

666436161253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 49.

The spelling of 666436161253 in words is "six hundred sixty-six billion, four hundred thirty-six million, one hundred sixty-one thousand, two hundred fifty-three".